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Sodium has a melting point of 97.72 oC and rubidium has a melting point of 39.48 oC.
Lower.
Caesium melts at 28.44oC, which is the lowest known melting point for any metallic element other than mercury. Certain radioactive elements might have lower melting points if it were possible to collect a large enough quantity of them to actually determine the melting point. For example, the melting point of francium is expected to be lower than that of caesium (but still higher than that of mercury). Also, some alloys melt at low temperatures. A eutectic alloy of sodium and potassium melts at around -12oC, still higher than mercury, but below caesium (and well below either sodium or potassium alone as well).
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It requires much more energy to convert the liquid potassium into a vapor than it does to convert the solid to a liquid.
Sodium has a melting point of 97.72 oC and rubidium has a melting point of 39.48 oC.
The melting point of sodium chloride is 801 0C. The melting point of phosphorus trichloride is -93,6 0C.
LOWER
Sodium Chloride has a higher melting point because at room temperature it is a solid but Ethyl alcohol has already melted, as it is liquid.
Common table salt (sodium chloride) has a much higher melting point than either sodium or chlorine.
The elements like sodium and potassium are not malleable. They are soft and have low melting point.
Lower.
The melting point of sodium chloride is 801 0C. The melting point of aluminium oxide is 2 072 0C.
aluminum oxide : Al2O3
Caesium melts at 28.44oC, which is the lowest known melting point for any metallic element other than mercury. Certain radioactive elements might have lower melting points if it were possible to collect a large enough quantity of them to actually determine the melting point. For example, the melting point of francium is expected to be lower than that of caesium (but still higher than that of mercury). Also, some alloys melt at low temperatures. A eutectic alloy of sodium and potassium melts at around -12oC, still higher than mercury, but below caesium (and well below either sodium or potassium alone as well).
The melting point of sodium chloride is 801 0C.
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